Knox Anchor
Designed for the World's Toughest Seabeds.
1. Select Your Knox Anchor Size
2. Add a Premium Swivel
3. Secure with High-Tensile Shackles
4. Add Chain Snubber / Shock Absorber
All UK orders include VAT and will be dispatched next day. Estimated delivery is <5 days after ordering.
Orders shipped outside the UK are supplied without UK VAT. Local import VAT, customs duties and courier clearance fees may apply and are the customer’s responsibility.
Encrypted Checkout • Heavy freight routing calculated at checkout
Vessel Parameters
Frequently Asked Questions
Got questions? Find answers to our most popular questions here.
How do I choose the right Knox size for my boat?
Knox sizing depends on boat displacement, windage, and how you anchor — not just length.
As a general guide:
- Day anchoring / fair weather → standard Knox size
- Overnight / exposed / liveaboard anchoring → one size up
Many owners choose the next size up for additional margin. That’s normal and supported by the design philosophy. If you’re unsure, we’re happy to recommend a sensible range rather than a single “perfect” size.
Should I size up my anchor?
Sizing up by one step is common and often beneficial if you:
- anchor overnight regularly
- expect changing conditions
- prefer additional margin
- cruise unfamiliar anchorages
Extreme oversizing beyond one step is rarely useful and can introduce fit, handling, and stowage issues without meaningful holding gains.
Is a heavier anchor always better?
No. Holding depends far more on geometry and burial behaviour than weight alone.
Knox is designed to achieve high holding relative to its weight by digging and remaining engaged as load increases. Simply increasing anchor mass without effective burial does not guarantee better holding.
Will a Knox anchor fit my bow roller?
Most do, but bow roller geometry varies significantly between boats — even within the same model.
Key checks are:
- fluke-to-hull clearance
- roll-bar-to-pulpit clearance
- roller width and axle position
- windlass spacing
We provide templates and visual guides to help confirm fit before ordering. If in doubt, send us a photo of your bow and we can usually advise quickly.
What measurements do I need to confirm fit?
The most useful measurements are:
- roller width
- distance from roller axle to bow
- clearance between roller and pulpit
- windlass position relative to roller
These determine how the anchor will sit when stowed.
Will the fluke hit my hull?
This depends mainly on stem angle. Boats with vertical or plumb bows require closer checking. The 1:1 template or clearance diagram allows you to verify this before purchase.
Will the roll bar interfere with my pulpit or fittings?
Roll bar clearance varies widely between pulpits. Most installations work without modification, but this is one of the primary fit checks.
If clearance is tight, a photo usually resolves it quickly.
Can I store a Knox anchor in a locker instead of on the bow?
Yes, if locker dimensions allow. Knox anchors are one-piece and structurally robust, so locker storage is mechanically fine.
However, most installations use bow-roller stowage for deployment convenience.
How does the fit check process work?
If you’re unsure:
- Measure or photograph your bow setup
- Note your boat model and intended Knox size
- Send this to us
We’ll confirm whether fit is likely or advise any considerations. There’s no pressure to buy.
Can you help me choose before ordering?
Yes. If you’re unsure about size or fit, contact us with your boat details or a photo of your bow. We’ll help you choose confidently.